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-'\" 
-'\" Copyright (c) 1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH fblocked n 7.5 Tcl "Tcl Built-In Commands"
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-fblocked \- Test whether the last input operation exhausted all available input
-.SH SYNOPSIS
-\fBfblocked \fIchannelId\fR
-.BE
-
-.SH DESCRIPTION
-.PP
-The \fBfblocked\fR command returns 1 if the most recent input operation
-on \fIchannelId\fR returned less information than requested because all
-available input was exhausted.
-For example, if \fBgets\fR is invoked when there are only three
-characters available for input and no end-of-line sequence, \fBgets\fR
-returns an empty string and a subsequent call to \fBfblocked\fR will
-return 1.
-.PP
-\fIChannelId\fR must be an identifier for an open channel such as a
-Tcl standard channel (\fBstdin\fR, \fBstdout\fR, or \fBstderr\fR),
-the return value from an invocation of \fBopen\fR or \fBsocket\fR, or
-the result of a channel creation command provided by a Tcl extension.
-.SH EXAMPLE
-The \fBfblocked\fR command is particularly useful when writing network
-servers, as it allows you to write your code in a line-by-line style
-without preventing the servicing of other connections.  This can be
-seen in this simple echo-service:
-.PP
-.CS
-# This is called whenever a new client connects to the server
-proc connect {chan host port} {
-    set clientName [format <%s:%d> $host $port]
-    puts "connection from $clientName"
-    fconfigure $chan -blocking 0 -buffering line
-    fileevent $chan readable [list echoLine $chan $clientName]
-}
-
-# This is called whenever either at least one byte of input
-# data is available, or the channel was closed by the client.
-proc echoLine {chan clientName} {
-    gets $chan line
-    if {[eof $chan]} {
-        puts "finishing connection from $clientName"
-        close $chan
-    } elseif {![\fBfblocked\fR $chan]} {
-        # Didn't block waiting for end-of-line
-        puts "$clientName - $line"
-        puts $chan $line
-    }
-}
-
-# Create the server socket and enter the event-loop to wait
-# for incoming connections...
-socket -server connect 12345
-vwait forever
-.CE
-.SH "SEE ALSO"
-gets(n), open(n), read(n), socket(n), Tcl_StandardChannels(3)
-.SH KEYWORDS
-blocking, nonblocking